KYIV, Ukraine (AP) — Russian President Vladimir Putin has ordered a partial mobilization of reservists in Russia. It’s an unpopular step that sparked rare protests across the country and led to almost 1,200 arrests. Putin’s order follows humiliating setbacks for his troops nearly seven months after invading Ukraine. It’s the first mobilization in Russia since World War II. Western backers of Ukraine derided the move as an act of weakness. The Russian leader warned the West he isn’t bluffing about using everything at his disposal to protect Russian territory. This appeared to be a veiled reference to his nuclear arsenal.